Table 4.

The results of the quantitative inversion models of soil organic matter.

Study Area	Model	Learning Rate	Loss Function	Estimators	${\mathit{R}}_{\mathit{p}}^2$	$\mathit{R}\mathit{M}\mathit{S}{\mathit{E}}_{\mathit{p}}$	$\mathit{M}\mathit{A}{\mathit{E}}_{\mathit{p}}$
Northwest China	AdaBoost-KRR	0.05	Square	300	0.91	0.22	0.20
Honghu	AdaBoost-RR	1.0	Linear	50	0.86	0.72	0.56